ar X iv : m at h / 05 07 14 6 v 1 [ m at h . O A ] 7 J ul 2 00 5 EXACTNESS FROM PROPER ACTIONS

ar X iv : m at h / 06 07 13 0 v 1 [ m at h . A G ] 5 J ul 2 00 6 TWISTED LOOP GROUPS AND THEIR AFFINE FLAG VARIETIES

ar X iv : a st ro - p h / 05 07 14 5 v 1 6 J ul 2 00 5 X - ray Pulsations in the Supersoft X - ray Binary CAL 83

Received ; accepted – 2 – ABSTRACT Chandra and XMM-Newton X-ray data reveal that the supersoft X-ray binary CAL 83 exhibits 38.4 minute pulsations at some epochs. These X-ray variations are similar to those found in some novae and are likely to be caused by nonradial pulsations the white dwarf. This is the first detection of pulsations in a persistent supersoft source.

ar X iv : m at h / 06 05 64 5 v 1 [ m at h . A G ] 2 4 M ay 2 00 6 ON NORI ’ S FUNDAMENTAL GROUP SCHEME

The aim of this note is to give two structure theorems on Nori’s fundamental group scheme of a proper connected variety defined over a perfect field and endowed with a rational point.

ar X iv : m at h / 05 08 29 7 v 1 [ m at h . ST ] 1 6 A ug 2 00 5 CONVERGENCE OF ESTIMATORS IN LLS ANALYSIS

We establish necessary and sufficient conditions for consistency of estimators of mixing distribution in linear latent structure analysis.

ar X iv : m at h / 05 03 14 5 v 1 [ m at h . D G ] 8 M ar 2 00 5 RIGIDITY AND FLEXIBILITY IN POISSON GEOMETRY

We study rigidity and flexibility phenomena in the context of Poisson geometry.